Question: What position did Umar ibn Al-Khattab hold starting in 634-0-0?
Paraphrase: Which was the designation of Umar ibn Al-Khattab during 634-0-0?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q8467 p:P39 ?s . ?s ps:P39 ?obj . ?s pq:P580 ?x filter(contains(?x , '634-0-0')) }